US20110024209A1 - Motor vehicle with system for conditioning power take-off enablement on an engine compartment being closed - Google Patents
Motor vehicle with system for conditioning power take-off enablement on an engine compartment being closed Download PDFInfo
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- US20110024209A1 US20110024209A1 US12/511,156 US51115609A US2011024209A1 US 20110024209 A1 US20110024209 A1 US 20110024209A1 US 51115609 A US51115609 A US 51115609A US 2011024209 A1 US2011024209 A1 US 2011024209A1
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- United States
- Prior art keywords
- power take
- unit
- compartment
- hood
- controller
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K25/00—Auxiliary drives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K28/00—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions
- B60K28/10—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle
- B60K28/12—Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the event of potentially dangerous conditions responsive to conditions relating to the vehicle responsive to conditions relating to doors or doors locks, e.g. open door
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/188—Controlling power parameters of the driveline, e.g. determining the required power
- B60W30/1886—Controlling power supply to auxiliary devices
- B60W30/1888—Control of power take off [PTO]
Definitions
- This disclosure relates to motor vehicles that at times use their engines to operate accessory devices or equipment via power take-offs.
- Such vehicles include, for example, commercial utility vehicles that use power take-offs to operate equipment such as hydraulic pumps.
- Such a vehicle typically has a front-end engine compartment containing a powerplant, such as an internal combustion or hybrid-electric engine, that powers the vehicle.
- the engine is part of the vehicle's powertrain which in a rear wheel drive vehicle comprises a transmission coupled to the engine, a driveshaft coupling the transmission to a differential of a rear axle, and driven road wheels at the ends of the axle.
- the power take-off unit has an input that is coupled either to the engine or to the transmission. While there are various types of power take-off units, they share a common characteristic of having a mechanism that is controlled in some manner for selectively coupling and uncoupling the unit's output to and from the unit's input.
- a typical front-end engine compartment is essentially closed along its sides and top, but is partially open at the front to allow air to pass through a radiator that is disposed between the frontal opening and the engine to allow air to pass through a radiator in the engine cooling system and the engine compartment and eventually to exit by passing downward and under the vehicle body. Access to the engine compartment interior is available by opening a hood of the vehicle.
- the engine may be cranked and started by operating the usual ignition switch in the occupant compartment of the vehicle while the hood is open. It may also be possible for the hood to be opened while the engine is running. Opening the hood to access the engine, either when running or when being cranked and started by the ignition switch, may be important for diagnostic or other purposes.
- Embodiments disclosed herein relate to a motor vehicle with a system for conditioning power take-off enablement.
- the motor vehicle comprises a powerplant, including an internal combustion engine, for propelling the motor vehicle.
- the powerplant is housed in a compartment.
- a hood is positionable relative to the compartment to selectively allow and disallow access to the compartment.
- a power take-off unit comprises an input mechanically coupled to the powerplant and is selectively enabled by a controller for coupling an output of the power take-off unit to the input of the power take-off unit when enabled by the controller and uncoupling the output of the power take-off unit from the input of the power take-off unit when not enabled by the controller is included.
- a device whose status distinguishes between the hood allowing access to the compartment and the hood disallowing access to the compartment for causing the controller not to enable the power take-off unit when the device discloses that the hood is allowing access to the compartment is provided.
- FIG. 1 is partial side elevation view of a portion of a vehicle.
- FIG. 2 is a schematic diagram showing portions of the vehicle relevant to the present disclosure.
- FIG. 3 is a diagram showing a portion of the vehicle's powertrain, including a power take-off.
- FIG. 4 is cross section through the power take-off on a larger scale.
- Embodiments disclosed herein relate to a motor vehicle with a system for conditioning power take-off enablement.
- an engaged power take-off may be operating an accessory, such as a hydraulic pump, using the electric motor/generator as an electric motor while the internal combustion engine is shut off.
- an automatic start routine in a controller will crank and start the internal combustion engine to continue operation of the accessory that is being operated via the power take-off while also restoring battery bank state-of-charge.
- the present disclosure provides a system and method for avoiding exposure of personnel to such a situation.
- a motor vehicle comprising a powerplant, including an internal combustion engine, for propelling the vehicle, a compartment within which the powerplant is housed, a hood that is positionable relative to the compartment to selectively allow and disallow access to the compartment, a power take-off unit that comprises an input mechanically coupled to the powerplant and that is selectively enabled by a controller for coupling an output of the power take-off unit to the input of the power take-off unit when enabled by the controller and uncoupling the output of the power take-off unit from the input of the power take-off unit when not enabled by the controller, and a device whose status distinguishes between the hood allowing access to the compartment and the hood disallowing access to the compartment for causing the controller not to enable the power take-off unit when the device discloses that the hood is allowing access to the compartment.
- Another embodiment provides a method for controlling a controller that selectively enables a power take-off unit to couple an output of the power take-off unit to an input of the power take-off unit that is coupled to a powerplant disposed in a compartment of a motor vehicle having a hood that is positionable relative to the compartment to selectively allow and disallow access to the compartment.
- the method comprises disallowing the controller to enable the power take-off unit when the hood is allowing access to the compartment.
- FIG. 1 shows an example of a vehicle 10 that has a front-end engine compartment 12 housing a hybrid-electric engine 14 for propelling the vehicle via a drivetrain, shown in FIG. 3 to comprise a transmission 16 , a driveshaft 18 , and a rear axle 20 having driven road wheels 22 at its ends.
- a drivetrain shown in FIG. 3 to comprise a transmission 16 , a driveshaft 18 , and a rear axle 20 having driven road wheels 22 at its ends.
- Engine 14 comprises an internal combustion engine 24 and an electric motor/generator 26 .
- a clutch 28 is disposed between a flywheel 30 and a shaft 32 coming from transmission 16 for selectively engaging and disengaging the flywheel with and from the shaft.
- Electric motor/generator 26 comprises an armature 34 that is splined to shaft 32 and a stator 36 electromagnetically coupled with the armature.
- motor/generator 26 When motor/generator 26 is operating as a motor that is powered by a battery bank 38 , it delivers torque to shaft 32 , adding propulsion torque to the drivetrain.
- motor/generator 26 operates as a generator that delivers charge to battery bank 38 .
- clutch 28 When clutch 28 is engaged, engine 24 can deliver torque to shaft 32 . When clutch 28 is disengaged, engine 24 can deliver no torque to shaft 32 and it is not an additional load on the drivetrain.
- a power take-off unit 40 is shown mounted on transmission 16 in FIG. 3 .
- Unit 40 has an input gear 42 operatively coupled with a gear 44 in transmission 16 for causing an output shaft 46 of unit 40 to turn when shaft 32 is turning and unit 40 is engaged to couple gear 42 to shaft 46 .
- a coupling 48 on the exterior of unit 40 provides an operative coupling of shaft 46 to a driven load, such as a hydraulic pump.
- Unit 40 has an internal mechanism 49 , shown by way of example as a clutch, for selectively connecting shaft 46 to, and disconnecting shaft 46 from, gear 42 to correspondingly engage, and disengage, unit 40 .
- an electromagnetic-actuated fluid control valve 50 is the device that performs the engagement and disengagement via a fluid- or pneumatic-actuated piston 51 .
- Valve 50 itself is controlled by an electromagnetic actuator 52 that is electrically connected with a controller 60 shown in FIG. 2 .
- a switch 72 on valve 50 discloses when controller 60 is causing actuator 52 to operate valve 50 to a condition that allows fluid or pneumatic pressure provided by a source, such as an air tank or transmission charge oil pump to force piston 51 to engage mechanism 49 .
- a hood 54 of vehicle 10 is shown swung open to allow access to engine compartment 12 and its contents.
- hood 54 closes engine compartment 12 from the top and sides.
- Hood 54 is partially open however through a grille at the front 56 to allow air to pass through a radiator that is disposed between the grille and engine 24 as an element of the engine's cooling system. Air passing that has passed through the radiator flows through the engine compartment 12 eventually exits by passing downward and under the vehicle body 58 that is immediately rearward of compartment 12 .
- FIG. 2 shows a portion of an electrical system of vehicle 10 to comprise an electronics system controller (ESC) 60 and associated data links such as 62 , 64 , 66 via which ESC 60 can communicate with other devices in the electrical system, including an instrument panel module 68 within an occupant compartment of body 58 .
- ESC electronics system controller
- Power take-off unit 40 ( FIG. 2 shows a different model from the one in FIGS. 3 and 4 ) is selectively enabled by ESC 60 for allowing equipment connected to coupling 48 to be operated by engine 14 .
- actuator 52 operates valve 50 to cause pressurized fluid from an on-board source to act on the internal engagement/disengagement mechanism of unit 40 and cause the power take-off's output to become coupled to its input.
- valve 50 doesn't allow pressurized fluid to be effective on the engagement/disengagement mechanism of unit 40 , consequently disconnecting the power take-off's output from its input.
- Vehicle 10 also has a remote power module (RPM) 70 that can provide electricity to various electrical equipment that may or may not be associated with the equipment being operated by the power take-off.
- RPM 70 is enabled by a signal given by a switch 72 on valve 50 that discloses when power take-off unit 40 is being enabled by ESC 60 .
- RPM 70 broadcasts its enabled condition via data link 66 for potential use by other devices or systems. In this way enablement of RPM 70 is conditioned on engagement of power take-off unit 40 . Alternatively, the engaged condition of unit 40 could be directly broadcast on a data link.
- the status of hood 54 as being either open or closed is given to ESC 60 by a switch 74 associated with the hood.
- Switch 74 comprises an suitable mechanism such as a gravity-responsive rolling magnet 76 that can roll internally from one end to the other depending on the inclination of the hood.
- the orientation of the switch is set such that the switch will indicate that the hood is closed when it is raised no more than some minimal amount and that the hood is open when raised beyond that amount.
Abstract
Description
- This disclosure relates to motor vehicles that at times use their engines to operate accessory devices or equipment via power take-offs. Such vehicles include, for example, commercial utility vehicles that use power take-offs to operate equipment such as hydraulic pumps.
- Such a vehicle typically has a front-end engine compartment containing a powerplant, such as an internal combustion or hybrid-electric engine, that powers the vehicle. The engine is part of the vehicle's powertrain which in a rear wheel drive vehicle comprises a transmission coupled to the engine, a driveshaft coupling the transmission to a differential of a rear axle, and driven road wheels at the ends of the axle.
- The power take-off unit has an input that is coupled either to the engine or to the transmission. While there are various types of power take-off units, they share a common characteristic of having a mechanism that is controlled in some manner for selectively coupling and uncoupling the unit's output to and from the unit's input.
- A typical front-end engine compartment is essentially closed along its sides and top, but is partially open at the front to allow air to pass through a radiator that is disposed between the frontal opening and the engine to allow air to pass through a radiator in the engine cooling system and the engine compartment and eventually to exit by passing downward and under the vehicle body. Access to the engine compartment interior is available by opening a hood of the vehicle.
- Although access to the engine compartment and its contents is restricted when the hood is closed, it may be possible for the engine to be cranked and started by operating the usual ignition switch in the occupant compartment of the vehicle while the hood is open. It may also be possible for the hood to be opened while the engine is running. Opening the hood to access the engine, either when running or when being cranked and started by the ignition switch, may be important for diagnostic or other purposes.
- Embodiments disclosed herein relate to a motor vehicle with a system for conditioning power take-off enablement. In one embodiment, the motor vehicle comprises a powerplant, including an internal combustion engine, for propelling the motor vehicle. The powerplant is housed in a compartment. A hood is positionable relative to the compartment to selectively allow and disallow access to the compartment. A power take-off unit comprises an input mechanically coupled to the powerplant and is selectively enabled by a controller for coupling an output of the power take-off unit to the input of the power take-off unit when enabled by the controller and uncoupling the output of the power take-off unit from the input of the power take-off unit when not enabled by the controller is included. A device whose status distinguishes between the hood allowing access to the compartment and the hood disallowing access to the compartment for causing the controller not to enable the power take-off unit when the device discloses that the hood is allowing access to the compartment is provided.
-
FIG. 1 is partial side elevation view of a portion of a vehicle. -
FIG. 2 is a schematic diagram showing portions of the vehicle relevant to the present disclosure. -
FIG. 3 is a diagram showing a portion of the vehicle's powertrain, including a power take-off. -
FIG. 4 is cross section through the power take-off on a larger scale. - Embodiments disclosed herein relate to a motor vehicle with a system for conditioning power take-off enablement. For example in a parallel-configured hybrid-electric vehicle, an engaged power take-off may be operating an accessory, such as a hydraulic pump, using the electric motor/generator as an electric motor while the internal combustion engine is shut off. Should the state-of-charge of the DC battery bank that is powering the electric motor/generator deplete to a level at which the battery bank needs to be re-charged, an automatic start routine in a controller will crank and start the internal combustion engine to continue operation of the accessory that is being operated via the power take-off while also restoring battery bank state-of-charge.
- If the engine compartment is open when this occurs, a person who might be working on the engine or equipment in the engine compartment is apt to be surprised and possibly exposed to suddenly moving parts on the exterior of the engine, such as drive belts and pulleys.
- The present disclosure provides a system and method for avoiding exposure of personnel to such a situation.
- One general aspect of this disclosure relates to a motor vehicle comprising a powerplant, including an internal combustion engine, for propelling the vehicle, a compartment within which the powerplant is housed, a hood that is positionable relative to the compartment to selectively allow and disallow access to the compartment, a power take-off unit that comprises an input mechanically coupled to the powerplant and that is selectively enabled by a controller for coupling an output of the power take-off unit to the input of the power take-off unit when enabled by the controller and uncoupling the output of the power take-off unit from the input of the power take-off unit when not enabled by the controller, and a device whose status distinguishes between the hood allowing access to the compartment and the hood disallowing access to the compartment for causing the controller not to enable the power take-off unit when the device discloses that the hood is allowing access to the compartment.
- Another embodiment provides a method for controlling a controller that selectively enables a power take-off unit to couple an output of the power take-off unit to an input of the power take-off unit that is coupled to a powerplant disposed in a compartment of a motor vehicle having a hood that is positionable relative to the compartment to selectively allow and disallow access to the compartment. The method comprises disallowing the controller to enable the power take-off unit when the hood is allowing access to the compartment.
-
FIG. 1 shows an example of avehicle 10 that has a front-end engine compartment 12 housing a hybrid-electric engine 14 for propelling the vehicle via a drivetrain, shown inFIG. 3 to comprise atransmission 16, adriveshaft 18, and arear axle 20 having drivenroad wheels 22 at its ends. -
Engine 14 comprises aninternal combustion engine 24 and an electric motor/generator 26. Aclutch 28 is disposed between aflywheel 30 and ashaft 32 coming fromtransmission 16 for selectively engaging and disengaging the flywheel with and from the shaft. - Electric motor/
generator 26 comprises an armature 34 that is splined toshaft 32 and astator 36 electromagnetically coupled with the armature. When motor/generator 26 is operating as a motor that is powered by a battery bank 38, it delivers torque toshaft 32, adding propulsion torque to the drivetrain. During vehicle deceleration, motor/generator 26 operates as a generator that delivers charge to battery bank 38. - When
clutch 28 is engaged,engine 24 can deliver torque toshaft 32. Whenclutch 28 is disengaged,engine 24 can deliver no torque toshaft 32 and it is not an additional load on the drivetrain. - A power take-
off unit 40 is shown mounted ontransmission 16 inFIG. 3 .Unit 40, details of which are better shown on a larger scale inFIG. 4 , has aninput gear 42 operatively coupled with a gear 44 intransmission 16 for causing anoutput shaft 46 ofunit 40 to turn whenshaft 32 is turning andunit 40 is engaged tocouple gear 42 toshaft 46. Acoupling 48 on the exterior ofunit 40 provides an operative coupling ofshaft 46 to a driven load, such as a hydraulic pump. -
Unit 40 has aninternal mechanism 49, shown by way of example as a clutch, for selectively connectingshaft 46 to, and disconnectingshaft 46 from,gear 42 to correspondingly engage, and disengage,unit 40. While the mechanism itself is basically mechanical, an electromagnetic-actuatedfluid control valve 50 is the device that performs the engagement and disengagement via a fluid- or pneumatic-actuatedpiston 51. Valve 50 itself is controlled by anelectromagnetic actuator 52 that is electrically connected with acontroller 60 shown inFIG. 2 . Aswitch 72 onvalve 50 discloses whencontroller 60 is causingactuator 52 to operatevalve 50 to a condition that allows fluid or pneumatic pressure provided by a source, such as an air tank or transmission charge oil pump to forcepiston 51 to engagemechanism 49. - In
FIG. 1 , ahood 54 ofvehicle 10 is shown swung open to allow access toengine compartment 12 and its contents. When swung down as suggested byarrow 55, hood 54closes engine compartment 12 from the top and sides. Hood 54 is partially open however through a grille at thefront 56 to allow air to pass through a radiator that is disposed between the grille andengine 24 as an element of the engine's cooling system. Air passing that has passed through the radiator flows through theengine compartment 12 eventually exits by passing downward and under thevehicle body 58 that is immediately rearward ofcompartment 12. -
FIG. 2 shows a portion of an electrical system ofvehicle 10 to comprise an electronics system controller (ESC) 60 and associated data links such as 62, 64, 66 via which ESC 60 can communicate with other devices in the electrical system, including aninstrument panel module 68 within an occupant compartment ofbody 58. - Power take-off unit 40 (
FIG. 2 shows a different model from the one inFIGS. 3 and 4 ) is selectively enabled by ESC 60 for allowing equipment connected tocoupling 48 to be operated byengine 14. When ESC 60 is enablingunit 40,actuator 52 operatesvalve 50 to cause pressurized fluid from an on-board source to act on the internal engagement/disengagement mechanism ofunit 40 and cause the power take-off's output to become coupled to its input. WhenESC 60 is not enablingunit 40,valve 50 doesn't allow pressurized fluid to be effective on the engagement/disengagement mechanism ofunit 40, consequently disconnecting the power take-off's output from its input. -
Vehicle 10 also has a remote power module (RPM) 70 that can provide electricity to various electrical equipment that may or may not be associated with the equipment being operated by the power take-off.RPM 70 is enabled by a signal given by aswitch 72 onvalve 50 that discloses when power take-off unit 40 is being enabled byESC 60. Once enabled, RPM 70 broadcasts its enabled condition viadata link 66 for potential use by other devices or systems. In this way enablement ofRPM 70 is conditioned on engagement of power take-off unit 40. Alternatively, the engaged condition ofunit 40 could be directly broadcast on a data link. -
ESC 60 conditions enablement ofunit 40 andRPM 70 by an enablement strategy that includes the status ofhood 54. The status ofhood 54 as being either open or closed is given toESC 60 by aswitch 74 associated with the hood.Switch 74 comprises an suitable mechanism such as a gravity-responsiverolling magnet 76 that can roll internally from one end to the other depending on the inclination of the hood. The orientation of the switch is set such that the switch will indicate that the hood is closed when it is raised no more than some minimal amount and that the hood is open when raised beyond that amount.
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US12/511,156 US8056661B2 (en) | 2009-07-29 | 2009-07-29 | Motor vehicle with system for conditioning power take-off enablement on an engine compartment being closed |
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US12/511,156 US8056661B2 (en) | 2009-07-29 | 2009-07-29 | Motor vehicle with system for conditioning power take-off enablement on an engine compartment being closed |
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Cited By (1)
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US20130300760A1 (en) * | 2012-05-08 | 2013-11-14 | Sony Corporation | Image display apparatus, image display program, and image display method |
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US11472308B2 (en) | 2019-04-05 | 2022-10-18 | Oshkosh Corporation | Electric concrete vehicle systems and methods |
WO2021072121A1 (en) | 2019-10-11 | 2021-04-15 | Oshkosh Corporation | Hybrid fire fighting vehicle |
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US5669842A (en) * | 1996-04-29 | 1997-09-23 | General Motors Corporation | Hybrid power transmission with power take-off apparatus |
US7104920B2 (en) * | 2004-09-07 | 2006-09-12 | Eaton Corporation | Hybrid vehicle powertrain system with power take-off driven vehicle accessory |
US20090255775A1 (en) * | 2008-04-12 | 2009-10-15 | Jean Viaud | Agricultural Implement And A Vehicle Combination Having A Sensor To Detect The Open Condition Of A Cover |
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2009
- 2009-07-29 US US12/511,156 patent/US8056661B2/en active Active
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US5669842A (en) * | 1996-04-29 | 1997-09-23 | General Motors Corporation | Hybrid power transmission with power take-off apparatus |
US7104920B2 (en) * | 2004-09-07 | 2006-09-12 | Eaton Corporation | Hybrid vehicle powertrain system with power take-off driven vehicle accessory |
US20090255775A1 (en) * | 2008-04-12 | 2009-10-15 | Jean Viaud | Agricultural Implement And A Vehicle Combination Having A Sensor To Detect The Open Condition Of A Cover |
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